I'm currently trying to book an award flight from MAN / SLC and have been offered lots of diff choices, it might be worth looking at coach only options but it then sometimes throws up options if first class.
Also, if you keep revising the selection (untick more dates avail) it brings up options not previously shown.
I have one on hold now First/Business return, via AMS on a business jet op by PRIVATAIR for KLM for 95,000. They are out there but you need to have no other life to find them.